Differential Seals
WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
When installing shafts, do not allow splines to contact seals during installation or damage to the seals may occur.
Semi floating rear axle seals are susceptible to the same types of damage as drive pinion seals if incorrectly installed. The seal bore must be clean and the lip handled carefully to avoid cutting or tearing it. The seal journal surface must be free of nicks, gouges and rough surface texture.
For information on differential seals, refer to REAR DRIVE AXLE/DIFFERENTIAL - DANA 60 AND 70 article.